Opegrapha pertusariicola Coppins & P. James

Lichenologist, 11: 164 1979.
Synonyms:
Distribution: S - Si (Grillo & Cristaudo 1995, Brackel 2016).
Description: Thallus inapparent, not lichenized, the hyphae developing inside the thalli of Pertusaria-species, especially P. leioplaca, sometimes forming necrotic patches on the host thallus. Apothecia lirelliform, black, epruinose, simple or furcate, straight or slightly curved, 0.2-1 x 0.1-0.2 mm, with a slit-like disc (which sometimes is visible in the central parts of old apothecia) and a finely rugose proper margin. Proper exciple dark brown, 25-60 μm thick laterally, up to 115 μm thick at base, thinner and irregular below the hymenium, K+ green-black; epithecium brownish, K-; hymenium colourless to pale brown, 55-70 μm high, I+ blue in upper and lower parts, I+ reddish in the middle part; paraphysoids branched and anastomosing, 1.5-2 μm thick; hypothecium brown. Asci 4-spored, clavate, fissitunicate, without a K/I+ blue ring-structure in tholus, 48-60 x 12-18 μm. Ascospores (5-)6-septate, with an enlarged median cell, hyaline but sometimes turning brown when overmature, cylindrical, straight or slightly curved, 21-28(-31) x 4.5-6(-7) μm, with a 0.7-1 μm thick gelatinous perispore. Pycnidia immersed, brown-black. Conidia simple, hyaline, oblong-ellipsoid, often tapering towards one end, 3.3-4 x 0.8-1 μm. Photobiont absent. Spot tests: all negative. Chemistry: without lichen substances.
Note: a lichenicolous fungus growing on the thalli of Pertusaria-species, especially P. leioplaca, probably much more widespread.
Growth form: Lichenicolous fungus
Substrata: bark
Reproductive strategy: mainly sexual
paras Pertusaria spp.

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
INDEX FUNGORUM GBIF

Source: Westberg, M., Hammarström, O., Isaksson, R., Johansson, P., Thor, G., Vicente, R. & Svensson, M. 2023. Additions to the flora of lichenicolous fungi of Sweden. Graphis Scripta 35(2): 4–13. Oslo. ISSN 2002-4495. - CC BY-4.0
17 Aug. 2022, Vicente & Hammarström (UPS L-1047382). Scale bar = 0.5 mm


Lousiana State University - Source: https://cyberfloralouisiana.com/images/LSUCollections/Lichen/LSU/00/135/LSU00135637_5_WR.JPG
VEZDA Lich.Sel. Exs.1699



Felix Schumm - CC BY 4.0
[VZ1699], Magna Britannia. Caledonia. Mid-Perthshire. Aberfeldy, Glen Lyon, prope Woodend. In thallo Pertusariae leioplacae vigens, ad corticem Coryli. Leg. P. James et B. J. Coppins (no. 3834), 11.8.1976. EX A. VEZDA LICHENES SELECTI EXSICCATI NR. 1699.



Felix Schumm - CC BY 4.0
[VZ1699], Magna Britannia. Caledonia. Mid-Perthshire. Aberfeldy, Glen Lyon, prope Woodend. In thallo Pertusariae leioplacae vigens, ad corticem Coryli. Leg. P. James et B. J. Coppins (no. 3834), 11.8.1976. EX A. VEZDA LICHENES SELECTI EXSICCATI NR. 1699.